关键词: 浮游植物;生物多样性;时空变化;亦庄调节池;南水北调中线工程;

Abstract: In order to ensure the security and stabilization of water ecological environment in Yizhuang storage pond, the phytoplankton in the pond were monitored from January to August 2021, and Shannon-Wiener diversity index, Margalef richness index, Pielou evenness index were used to analyze the temporal and spatial variation of phytoplankton. The results showed that 135 kinds of phytoplankton in 7 phyla were found. Chlorophyta and bacillariophyta were the main phyla, accounting for 45% and 30% of the total species respectively. After the state of water supply in Yizhuang storage pond changed, the phenomenon of phytoplankton abnormal proliferation appeared in June, and the phytoplankton density reached 13.5 million cells/L, cyanophyta dominating. The spatial variation of phytoplankton density was significantly different in the pond. In the slow flowing zone, the phytoplankton density was significantly higher than other areas. The Shannon-Wiener diversity index of phytoplankton in Yizhuang storage pond ranged from 1 to 3, the Margalef richness index varied from 0.5 to 2.0, and Pielou evenness index was stable at about 0.5. The research results can provide support for normal and stable operation of Yizhuang storage pond.

Key words: phytoplankton; biological diversity; temporal and spatial variation; Yizhuang storage pond; South-to-North Water Diversion Project